Olneya tesota is a perennial flowering tree of the family Fabaceae, legumes, which is commonly known as ironwood, desert ironwood, or palo fierro in Spanish. It is the only species in the monotypic genus Olneya. This tree is part of the western Sonoran Desert in Mexico and United States.

Ironwood is a common name for many woods or plants that have a reputation for hardness, or specifically a wood density that is heavier than water, although usage of the name ironwood in English may or may not indicate a tree that yields such heavy wood.